Investigating structures in the ambient solar wind as tracers of solar wind formation. We use remote imaging data and in situ measurements in the heliosphere.
Ph.D. in Astronomy, Boston University, Boston, MA, January, 2010
"Periodic Solar Wind Density Structures"
M.A. in Astronomy, Boston University, Boston, MA, May, 2007
B.S. in Astronomy and Physics, University of Washington, Seattle, WA, June, 2004
Recipient of a NASA Early Career Achievement Medal, 2018
Recipient of the 2018 American Astronomical Society (AAS)/Solar Physics Division (SPD) Karen Harvey Prize for a significant contribution to the study of the Sun early in a person's professional career. Awarded ‘for her fundamental contributions to understanding coronal heating and the slow solar wind, and for her valuable service to the science community and the general public.’
Kepko, L., and N. M. Viall. 2019. "The Source, Significance, and Magnetospheric Impact of Periodic Density Structures Within Stream Interaction Regions." Journal of Geophysical Research: Space Physics, (In Press) [10.1029/2019ja026962]
Barnes, W. T., S. J. Bradshaw, and N. M. Viall. 2019. "Understanding Heating in Active Region Cores through Machine Learning. I. Numerical Modeling and Predicted Observables." The Astrophysical Journal, 880 (1): 56 [10.3847/1538-4357/ab290c]
Mason, E. I., S. K. Antiochos, and N. M. Viall. 2019. "Observations of Solar Coronal Rain in Null Point Topologies." The Astrophysical Journal Letters, 874 (2): L33 [10.3847/2041-8213/ab0c5d]
Di Matteo, S., N. M. Viall, L. Kepko, et al. S. Wallace, C. N. Arge, and P. MacNeice. 2019. "Helios Observations of Quasiperiodic Density Structures in the Slow Solar Wind at 0.3, 0.4, and 0.6 AU." Journal of Geophysical Research: Space Physics, 124 (2): 837-860 [10.1029/2018ja026182]
DeForest, C. E., R. A. Howard, M. Velli, N. Viall, and A. Vourlidas. 2018. "The Highly Structured Outer Solar Corona." The Astrophysical Journal, 862 (1): 18 [10.3847/1538-4357/aac8e3]
Nita, G. M., N. M. Viall, J. A. Klimchuk, et al. M. A. Loukitcheva, D. E. Gary, A. A. Kuznetsov, and G. D. Fleishman. 2018. "Dressing the Coronal Magnetic Extrapolations of Active Regions with a Parameterized Thermal Structure." The Astrophysical Journal, 853 (1): 66 [10.3847/1538-4357/aaa4bf]
Strong, K., N. Viall, J. Schmelz, and J. Saba. 2017. "Understanding Space Weather: Part III: The Sun’s Domain." Bulletin of the American Meteorological Society, 98 (12): 2593-2602 [10.1175/bams-d-16-0204.1]
Viall, N. M., and J. A. Klimchuk. 2017. "A Survey of Nanoflare Properties in Active Regions Observed with theSolar Dynamics Observatory." The Astrophysical Journal, 842 (2): 108 [10.3847/1538-4357/aa7137]
Viall, N. M., and J. A. Klimchuk. 2016. "SIGNATURES OF STEADY HEATING IN TIME LAG ANALYSIS OF CORONAL EMISSION." The Astrophysical Journal, 828 (2): 76 [10.3847/0004-637x/828/2/76]
DeForest, C. E., W. H. Matthaeus, N. M. Viall, and S. R. Cranmer. 2016. "FADING CORONAL STRUCTURE AND THE ONSET OF TURBULENCE IN THE YOUNG SOLAR WIND." The Astrophysical Journal, 828 (2): 66 [10.3847/0004-637x/828/2/66]
Kepko, L., N. Viall, S. K. Antiochos, et al. S. T. Lepri, J. C. Kasper, and M. Weberg. 2016. "Implications of L1 observations for slow solar wind formation by solar reconnection." Geophysical Research Letters, 43 (9): 4089–4097 [10.1002/2016gl068607]
Bradshaw, S. J., and N. M. Viall. 2016. "PATTERNS OF ACTIVITY IN A GLOBAL MODEL OF A SOLAR ACTIVE REGION." The Astrophysical Journal, 821 (1): 63 [10.3847/0004-637x/821/1/63]
Viall, N. M., and A. Vourlidas. 2015. "PERIODIC DENSITY STRUCTURES AND THE ORIGIN OF THE SLOW SOLAR WIND." The Astrophysical Journal, 807 (2): 176 [10.1088/0004-637x/807/2/176]
Viall, N. M., and J. A. Klimchuk. 2015. "THE TRANSITION REGION RESPONSE TO A CORONAL NANOFLARE: FORWARD MODELING AND OBSERVATIONS INSDO/AIA." The Astrophysical Journal, 799 (1): 58 [10.1088/0004-637x/799/1/58]
Hartinger, M. D., D. Welling, N. M. Viall, M. B. Moldwin, and A. Ridley. 2014. "The effect of magnetopause motion on fast mode resonance." Journal of Geophysical Research: Space Physics, 119 (10): 8212-8227 [10.1002/2014ja020401]
Uritskiy, V. M., J. M. Davila, N. M. Viall-Kepko, and L. Ofman. 2013. "MEASURING TEMPERATURE-DEPENDENT PROPAGATING DISTURBANCES IN CORONAL FAN LOOPS USING MULTIPLE SDO/AIA CHANNELS AND THE SURFING TRANSFORM TECHNIQUE." ASTROPHYSICAL JOURNAL, 778: [10.1088/0004-637X/778/1/26]
Viall, N. M., and J. A. Klimchuk. 2013. "Modeling the Line-of-Sight Integrated Emission in the Corona: Implications for Coronal Heating." The Astrophysical Journal, 771 (2): 115 [10.1088/0004-637X/771/2/115]
Viall, N., and J. Klimchuk. 2012. "Nanoflare Properties throughout Active Regions: Comparing SDO/AIA Observations with Modeled Active Region Light Curves." American Astronomical Society Meeting Abstracts #220, 220: #309.04-.
Viall, N., and J. Klimchuk. 2011. "Patterns of Nanoflare Heating Exhibited by Active Regions Observed with SDO/AIA." Bulletin of the American Astronomical Society, 2103-:
Viall, N. M., H. E. Spence, A. Vourlidas, and R. Howard. 2010. "Examining Periodic Solar-Wind Density Structures Observed in the SECCHI Heliospheric Imagers." Solar Physics, 261 (175): [10.1007/s11207-010-9633-1]
Viall, N. M., H. E. Spence, and J. Kasper. 2009. "Are periodic solar wind number density structures formed in the solar corona?" Geophysical Research Letters, 36 (23): L23102 [10.1029/2009GL041191]
Viall, N. M., E. L. Kepko, and H. E. Spence. 2009. "Relative occurrence rates and connection of discrete frequency oscillations in the solar wind density and dayside magnetosphere." J. Geophys. Res., 114 (A01201): [10.1029/2008JA013334]
Viall, N. M., L. Kepko, and H. E. Spence. 2008. "Inherent length-scales of periodic solar wind number density structures." Journal of Geophysical Research (Space Physics), 113: [7101 10.1029/2007JA012881]
Kepko, L., and N. M. Viall. 2019. "The Source, Significance, and Magnetospheric Impact of Periodic Density Structures Within Stream Interaction Regions." Journal of Geophysical Research: Space Physics (In Press) [10.1029/2019ja026962]
Barnes, W. T., S. J. Bradshaw, and N. M. Viall. 2019. "Understanding Heating in Active Region Cores through Machine Learning. I. Numerical Modeling and Predicted Observables." The Astrophysical Journal 880 (1): 56 [10.3847/1538-4357/ab290c]
Mason, E. I., S. K. Antiochos, and N. M. Viall. 2019. "Observations of Solar Coronal Rain in Null Point Topologies." The Astrophysical Journal Letters 874 (2): L33 [10.3847/2041-8213/ab0c5d]
Di Matteo, S., N. M. Viall, L. Kepko, et al. S. Wallace, C. N. Arge, and P. MacNeice. 2019. "Helios Observations of Quasiperiodic Density Structures in the Slow Solar Wind at 0.3, 0.4, and 0.6 AU." Journal of Geophysical Research: Space Physics 124 (2): 837-860 [10.1029/2018ja026182]
DeForest, C. E., R. A. Howard, M. Velli, N. Viall, and A. Vourlidas. 2018. "The Highly Structured Outer Solar Corona." The Astrophysical Journal 862 (1): 18 [10.3847/1538-4357/aac8e3]
Nita, G. M., N. M. Viall, J. A. Klimchuk, et al. M. A. Loukitcheva, D. E. Gary, A. A. Kuznetsov, and G. D. Fleishman. 2018. "Dressing the Coronal Magnetic Extrapolations of Active Regions with a Parameterized Thermal Structure." The Astrophysical Journal 853 (1): 66 [10.3847/1538-4357/aaa4bf]
Strong, K., N. Viall, J. Schmelz, and J. Saba. 2017. "Understanding Space Weather: Part III: The Sun’s Domain." Bulletin of the American Meteorological Society 98 (12): 2593-2602 [10.1175/bams-d-16-0204.1]
Viall, N. M., and J. A. Klimchuk. 2017. "A Survey of Nanoflare Properties in Active Regions Observed with theSolar Dynamics Observatory." The Astrophysical Journal 842 (2): 108 [10.3847/1538-4357/aa7137]
Viall, N. M., and J. A. Klimchuk. 2016. "SIGNATURES OF STEADY HEATING IN TIME LAG ANALYSIS OF CORONAL EMISSION." The Astrophysical Journal 828 (2): 76 [10.3847/0004-637x/828/2/76]
DeForest, C. E., W. H. Matthaeus, N. M. Viall, and S. R. Cranmer. 2016. "FADING CORONAL STRUCTURE AND THE ONSET OF TURBULENCE IN THE YOUNG SOLAR WIND." The Astrophysical Journal 828 (2): 66 [10.3847/0004-637x/828/2/66]
Kepko, L., N. Viall, S. K. Antiochos, et al. S. T. Lepri, J. C. Kasper, and M. Weberg. 2016. "Implications of L1 observations for slow solar wind formation by solar reconnection." Geophysical Research Letters 43 (9): 4089–4097 [10.1002/2016gl068607]
Bradshaw, S. J., and N. M. Viall. 2016. "PATTERNS OF ACTIVITY IN A GLOBAL MODEL OF A SOLAR ACTIVE REGION." The Astrophysical Journal 821 (1): 63 [10.3847/0004-637x/821/1/63]
Viall, N. M., and A. Vourlidas. 2015. "PERIODIC DENSITY STRUCTURES AND THE ORIGIN OF THE SLOW SOLAR WIND." The Astrophysical Journal 807 (2): 176 [10.1088/0004-637x/807/2/176]
Viall, N. M., and J. A. Klimchuk. 2015. "THE TRANSITION REGION RESPONSE TO A CORONAL NANOFLARE: FORWARD MODELING AND OBSERVATIONS INSDO/AIA." The Astrophysical Journal 799 (1): 58 [10.1088/0004-637x/799/1/58]
Hartinger, M. D., D. Welling, N. M. Viall, M. B. Moldwin, and A. Ridley. 2014. "The effect of magnetopause motion on fast mode resonance." Journal of Geophysical Research: Space Physics 119 (10): 8212-8227 [10.1002/2014ja020401]
Uritskiy, V. M., J. M. Davila, N. M. Viall-Kepko, and L. Ofman. 2013. "MEASURING TEMPERATURE-DEPENDENT PROPAGATING DISTURBANCES IN CORONAL FAN LOOPS USING MULTIPLE SDO/AIA CHANNELS AND THE SURFING TRANSFORM TECHNIQUE." ASTROPHYSICAL JOURNAL 778 [10.1088/0004-637X/778/1/26]
Viall, N. M., and J. A. Klimchuk. 2013. "Modeling the Line-of-Sight Integrated Emission in the Corona: Implications for Coronal Heating." The Astrophysical Journal 771 (2): 115 [10.1088/0004-637X/771/2/115]
Viall, N., and J. Klimchuk. 2012. "Nanoflare Properties throughout Active Regions: Comparing SDO/AIA Observations with Modeled Active Region Light Curves." American Astronomical Society Meeting Abstracts #220 220 #309.04-
Viall, N., and J. Klimchuk. 2011. "Patterns of Nanoflare Heating Exhibited by Active Regions Observed with SDO/AIA." Bulletin of the American Astronomical Society 2103-
Viall, N. M., H. E. Spence, A. Vourlidas, and R. Howard. 2010. "Examining Periodic Solar-Wind Density Structures Observed in the SECCHI Heliospheric Imagers." Solar Physics 261 (175): [10.1007/s11207-010-9633-1]
Viall, N. M., H. E. Spence, and J. Kasper. 2009. "Are periodic solar wind number density structures formed in the solar corona?" Geophysical Research Letters 36 (23): L23102 [10.1029/2009GL041191]
Viall, N. M., E. L. Kepko, and H. E. Spence. 2009. "Relative occurrence rates and connection of discrete frequency oscillations in the solar wind density and dayside magnetosphere." J. Geophys. Res. 114 (A01201): [10.1029/2008JA013334]
Viall, N. M., L. Kepko, and H. E. Spence. 2008. "Inherent length-scales of periodic solar wind number density structures." Journal of Geophysical Research (Space Physics) 113 [7101 10.1029/2007JA012881]